It is a bit messy if you try to choose the character in the game, i mean in the map.
Okay, i didn't tried this but i think it works. You can choose your character from the menu on where you choose your map like on where you choose whether you are zerg, terran or prottoss. Example, you have 3 char in the game, namely uber, ubar, and ubor
uber - terran
ubar - prottoss
ubor - zerg
You selected zerg, that would be ubor.
You will need to set the human player to user selectable and place the start location in a secret area
Then, the trigger goes like this...
Player 1 brings at least 1 Hatchery at 'location'
Create 1 ubor at 'location' for player 8
Kill all units for player 1
why did we created a unit for player 8? it should be neutral. P 8 is just a unit holder until the real thing happens.
The only drawback is
-you only have 3 char.
-there is no mission briefing (you must have a trailer for this)
Hope it works!
I thought of this technique while i was writing my rpg info on a paper.
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